An ultra-broadband cut-off filter with adjustable passband

A cut-off filter, ultra-broadband technology, used in optics, optical components, instruments, etc.

Active Publication Date: 2021-05-11
TIANJIN JINHANG INST OF TECH PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on the design and preparation of broadband cut-off filters with a bandwidth of tens of nm and adjustable bandwidth.

Method used

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  • An ultra-broadband cut-off filter with adjustable passband
  • An ultra-broadband cut-off filter with adjustable passband
  • An ultra-broadband cut-off filter with adjustable passband

Examples

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Embodiment

[0021] The following is an example design for 1064nm ultra-broadband cut-off (200nm-1000nm and 1130nm-1440nm, cut-off less than OD3) filter film (bandwidth ~ 60nm), the design steps are as follows:

[0022] According to the filter design requirements, choose HB850 colored glass (200nm ~ 800nm ​​cut-off) as the film substrate, the transmittance curve of HB850 substrate is as follows figure 2 shown.

[0023] Choose TiO 2 For high refractive index thin film material, SiO 2 For low refractive index thin film material, TiO 2 Thin films and SiO 2 The refractive index curve of the film is as image 3 shown.

[0024] According to the technical requirements, a long-wave pass filter film is designed on the surface of the HB850 substrate. The basic film structure is Sub / (0.5H L 0.5H)^18 / Air, the reference wavelength is 890nm, and the first 6 layers and the last 7 layers are optimized. The film structure is: Sub / 1.05H 0.53L 0.94H 1.04L 1.22H 0.74L(HL)^12 0.70H 1.18L 1.29H 0.75L 1.3...

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Abstract

The invention discloses an ultra-broadband cut-off filter with adjustable passband, which comprises a substrate, a long-wave pass filter film, a short-wave pass filter film, and a film system structure of the long-wave pass filter film formed on both sides of the substrate. It is Sub / (0.5H L 0.5H)^m / Air, m is 6~30; the film structure of short-wave pass filter film is Sub / (0.5L H 0.5L)^n / Air, n is 6~30; TiO 2 and SiO 2 They are high refractive index and low refractive index thin film materials respectively. The present invention designs a long-wave pass filter film on one side of the colored glass substrate, and a short-wave pass filter film on the other side surface, and adjusts the central wavelength of the long-wave pass filter film and the short-wave pass filter film, which can contribute to The adjustment of the passband bandwidth realizes the design of the passband-tunable ultra-broadband cut-off filter.

Description

technical field [0001] The invention belongs to the technical field of optical thin films, and relates to an ultra-broadband cut-off filter with adjustable passband. Background technique [0002] Band-pass filters are an important part of optical imaging systems. With the continuous development of space technology, band-pass filters are widely used in resource detection, ocean detection, climate observation, military reconnaissance, astronomical observation, etc., which can effectively reduce background Noise signal influence, improving the signal-to-noise ratio of the received signal, plays an irreplaceable role. In recent decades, my country's aerospace industry has developed rapidly, but there is still a certain gap compared with the world's high-level countries. Some bandpass filters need to be imported from abroad, and it is imminent to improve the ability to independently design and develop bandpass filters. [0003] At present, bandpass filters mainly include Fabry-P...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/28
CPCG02B5/285
Inventor 姜玉刚刘华松王利栓陈丹季一勤
Owner TIANJIN JINHANG INST OF TECH PHYSICS
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